Airworthiness Directive · Amendment 39-17358 · Rolls-Royce plc Turbofan Engines
Rolls-Royce plc Turbofan Engines
This AD applies to Rolls-Royce plc (RR) RB211-524D4-19, -524D4-B-19, -524D4-39, -524D4-B-39, -524D4X-19, -524D4X-B-19, -524H-36, -524H2-19, -524H-T-36, -524H2-T-19, -524G2-19, -524G3-19, -524G2-T-19, and -524G3-T-19 turbofan engines with thrust reverser units (TRUs) that have a part number (P/N) specified in paragraph 1.A. of RR Alert Non-Modification Service Bulletin (NMSB) No. RB.211-78-AG084, Revision 7, dated November 23, 2012, installed.
We are superseding an existing airworthiness directive (AD) for all Rolls-Royce plc (RR) RB211-524 series turbofan engines. That AD currently requires removal and repair of certain thrust reverser units (TRUs) prior to reinstallation. This AD requires the same actions for an expanded population of TRUs and extends the compliance time for repairing certain TRUs. This AD was prompted by additional engineering evaluation of TRUs, as a result of a translating cowl gearbox stubshaft failure and subsequent repair. We are issuing this AD to prevent failure of the attachment rivets, which may result in release of the TRU from the engine.
(1) If no repairs were performed as a result of a stubshaft failure, no further action is necessary.
(2) If before December 14, 2009, the TRU has incorporated Engine Manual repair No. FRS5887 and incorporated either Engine Manual repair No. FRS4976 or No. FRS6669 as a result of a translating cowl gearbox stubshaft failure, then repair the TRU before further flight. Use the procedures in Section 3., Accomplishment Instructions, of RR Alert NMSB No. RB.211-78-AG084, Revision 5, dated February 4, 2011, to do the repair.
(3) If before December 14, 2009, the TRU has incorporated Engine Manual repair No. FRS4976, or No. FRS6669 as a result of a translating cowl gearbox stubshaft failure, and it is not known whether Engine Manual repair No. FRS5887 was incorporated concurrently, then repair the TRU within 200 engine flight cycles after the effective date of this AD. Use the procedures in Section 3., Accomplishment Instructions, of RR Alert NMSB No. RB.211-78-AG084, Revision 5, dated February 4, 2011, to do the repair.
(4) If before December 14, 2009, the TRU has incorporated only Engine Manual repair No. FRS5887 as a result of a translating cowl gearbox stubshaft failure, then repair the TRU within 1,150 engine flight cycles after the effective date of this AD. Use the procedures in Section 3., Accomplishment Instructions, of RR Alert NMSB No. RB.211-78-AG084, Revision 7, dated November 23, 2012, to do the repair.
(5) If the TRU has previously been repaired at the front ring with additional rivets using Engine Manual repair No. FRS5887 Part 2, and has not had Engine Manual repair Nos. FRS4976 and FRS6669 applied to the rear ring at the No. 2 or No. 3 gearbox position:
(i) Remove the TRU from the engine during the next scheduled engine removal after the effective date of this AD; and
(ii) Before returning the TRU to service, repair the TRU using the procedure in Section 3.A.(4), Accomplishment Instructions, of RR Alert NMSB No. RB.211-78-AG084, Revision 7, dated November 23, 2012.
(1) Actions performed before the effective date of this AD using RR Alert NMSB No. RB.211-78-AG084, Revision 4, dated December 22, 2009, or RR Alert NMSB No. RB.211-78-AG084, Revision 3, dated November 24, 2009, satisfy the requirements of paragraphs (e)(2) and (e)(3) of this AD.
(2) Actions performed before the effective date of this AD using RR Alert NMSB No. RB.211-78-AG084, Revision 6, dated November 16, 2012, or Revision 5, dated February 4, 2011, or Revision 4, dated December 22, 2009, or Revision 3, dated November 24, 2009, satisfy the requirements of paragraph (e)(4) of this AD.
(3) Actions performed before the effective date of this AD using RR Alert NMSB No. RB.211-78-AG084, Revision 6, dated November 16, 2012, satisfy the requirements of paragraph (e)(5)(ii) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
